import Vue from 'vue'
import Router from 'vue-router'
import Login from './../components/Login'
import Home from './../components/Home'
import Welcome from './../components/Welcome'
import Users from './../components/user/Users'
import Rights from './../components/power/Rights'
import Roles from './../components/power/Roles'
import Cate from './../components/goods/Cate'
import Params from './../components/goods/Params'
import GoodsList from './../components/goods/List'
import Add from './../components/goods/Add'

Vue.use(Router)

const router = new Router( {
  // 如果访问了/的话，直接重定向，访问到/login
  routes: [
    {
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: Login
    },
    {
      path: '/home',
      component: Home,
      // 登录/home页面重定向到了/welcome
      redirect: '/welcome',
      children:[{
        path: '/welcome',
        component: Welcome
      },{
        path: '/users',
        component: Users
      },{
        path: '/rights',
        component: Rights
      },{
        path: '/roles',
        component: Roles
      },{
        path: '/categories',
        component: Cate
      },{
        path: '/params',
        component: Params
      },{
        path: '/goods',
        component: GoodsList
      },{
        path: '/goods/add',
        component: Add
      }]
    }
  ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
  //  to 将要访问的路径
  //  from 代表从哪个路径跳转而来
  //  next 是一个函数，表示放行
  //  next() 放行   next('/login') 强制跳转

  if (to.path === '/login') return next();
  //  获取token
  const tokenStr =  window.sessionStorage.getItem('token')
  // 没有登录，则返回/login登陆页面
  if (!tokenStr) return next('/login')
  // 登录后有token值，则返回/home页面
  next()
})

export default router
